Territory



(No Model.)

. A. A E. 85 H. BLAGKMAN.

GAR TRUCK.

Nb. 254,908. Patented Mar. 14,1882;

ATTORNEYS. I

UNITED STATES PATENT Qri icn.

ALANSON A. BLAOKMAN, ELHANAN BLAOKMAN, AND HYROAN-US BLACK- MAN, OF SNOHOMISH, WASHINGTON TERRITORY.

CAR-TRUCK.

SPECIFICATION forming part of Letters Patent No. 254,908, dated March 14, 1882.

Application filed January 9, 1882.

To all whom it may concern Be it-known that we, ALANSON A. BLACK MAN, ELHANAN 'BLAGKMAN, and HYRGANUS BLAGKMAN, of Snohomish, in the county of Suohomish and Territory of Washington, have invented a new and useful Improvement in Railwayflar Trucks, of which the followingis a full, clear, and exact description, reference being bad to the annexed drawings, forming [0 part of this specification.

This invention consists ofarailway-car truck of novel construction, which is adapted for use upon rails without ti'es, or upon any temporary railway having sharp curves either from a vertical or horizontal plane, such as may be laid upon an uneven surface without grading. In the accompanying drawings, Figure 1 is a plan view of our improved car-truck, showing its adaptation to a laterally-curved track.

' Fig. 2 is a side elevation of the same, and

Fig. 3 is a cross-section through one of the bolsters.

Similar letters of reference indicate corresponding parts throughout the several views.

This invention has special relation to cartrucks for transporting saw logs and other timbers to mills or shipping-points, in which case temporary railway-tracks are laid withon t gradlug. 0 Where a track is laid on uneven surface of ground it is of great importance that the cartruck shall be so constructed as to adaptitself automatically not. only to sharp curves from a vertical plane, but also to undulations from a 5 horizontal plane, to prevent straining. of the frame-work an d running-gear of the car-truck. To this end we employ a series of truck'frames, A, which are swiveled independently of each other to opposite sides of the running-gear by 40 means of bolts passing through the ends of the bolsters B.

Each truck-frame is provided with two Wheels arranged one in frontof the other, and the wheels are constructed with a double flange 5 adapted to overlap the rail on both sides, so that two rails shall thus bebraced without the use of cross'ties. The tread of the wheels is made slightly broader than the rails, in order that the two wheelsofeach truck-frame shall (No model.)

safely keep the track when turning a sharp 5o curve.

The advantage of-atruck-frame havingtwo wheels over one having but a single wheel is obvious in a case where great strength is desired; but such truck-frames have heretofore been more or less rigidly connected together in pairs, and when so connected an undue amountof friction is caused between the wheels and rails for want of sufficient flexibility. Where a temporary track is used, composed 6o frequently of wooden rails without ties, it is evident that a great degree of friction would necessitate constant repairing; but with the use of our independent two-wheeled truckframes such flexibility of movement and action is secured that wooden rails are found to answer our purpose most satisfactorily.

Each of the bolsters B is provided with a reach, 0, which is hinged thereto, so as to be adapted for vertical oscillation, and the reaches of two bolsters are made to overlap each other, so as to be secured together adjustbly by means of a bolt passing through perforations in both. The reaches are braced on opposite sides by rods 0, which are connected to the bolsters by flexible joints. With this construc-' tion the truck-frames are allowed to accommodate themselves to undulations in the track without disturbing the position of the load. It will be seen that this ear-truck is adapted for use under exceptional conditions, where almost any other car-truck in use would be all but impracticable, owing to the fact that a smooth and perfect track is presupposed as a condition of its usefulness. While this cartruck isprimarilydesigued for use upon rudelyconstructed tracks for the purpose of transporting immense timbers out of forests and for similar uses, it is evident that it is no less adapted for ordinary railways, and in some re- 0 spects it may be found to be better adapted for use upon ordinary railways than most: trucks that are in use.

Havingthus described our invention, what we claim as new, and desire to secure by Letters Patent, is"- v 1. In a car-truck, the combination, with a series ofindependent truck-frames and bolsters to which the truck-frames are swiveled, of reaches hinged to the bolsters, so as to allow vertical oscillation to the bolsters and truckframes, substantially as shown and described, whereby the car-truck shall be adapted to an uneven or undulating track, as set forth.

2. The combination, in a car-truck, of four independent truck-frames swiveled to the ends of the bolsters in pairs, and provided each with two double-flanged Wheels arranged one in front of the other, and a suitable gear for con- ALANSON A. BLAOKMAN. ELHANAN BLAOKMAN. HYROANUS BLAOKMAN.

Witnesses:

WM. WHITFIELD, GEORGE W. BOYCE. 

